Angina or not? Tests miss a blockage?

I have been suffering from on and off chest pain for last 1 year and the episodes intensified in last 15-20 days or so made me visit ER 2-3 times. The common findings were sinus tachycardia and High BP. I take metoprolol and Telisartan for that for last 6 months. I am finding it hard to do extertional things especially climbing up on Stairs and feels dizzy. I have had ECG two days back which came as abnormal and non specific ST changes but I was told these were normal variables. Previously I have had CT coronary angiogram in January 2022 and Stress Echocardiography in October 2021. Reports are attached. Is this still heart related ? Do I need to go for conventional angiogram? Can these tests miss a blockage? I feel I did what I could have done in terms of getting checked